1 /*- 2 * Copyright (c) 1998, 2001 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/module.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/uio.h> 36 #include <sys/fcntl.h> 37 38 #include <dev/smbus/smbconf.h> 39 #include <dev/smbus/smbus.h> 40 #include <dev/smbus/smb.h> 41 42 #include "smbus_if.h" 43 44 #define BUFSIZE 1024 45 46 struct smb_softc { 47 48 int sc_count; /* >0 if device opened */ 49 dev_t sc_devnode; 50 }; 51 52 #define IIC_SOFTC(unit) \ 53 ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit))) 54 55 #define IIC_DEVICE(unit) \ 56 (devclass_get_device(smb_devclass, (unit))) 57 58 static int smb_probe(device_t); 59 static int smb_attach(device_t); 60 static int smb_detach(device_t); 61 static void smb_identify(driver_t *driver, device_t parent); 62 63 static devclass_t smb_devclass; 64 65 static device_method_t smb_methods[] = { 66 /* device interface */ 67 DEVMETHOD(device_identify, smb_identify), 68 DEVMETHOD(device_probe, smb_probe), 69 DEVMETHOD(device_attach, smb_attach), 70 DEVMETHOD(device_detach, smb_detach), 71 72 /* smbus interface */ 73 DEVMETHOD(smbus_intr, smbus_generic_intr), 74 75 { 0, 0 } 76 }; 77 78 static driver_t smb_driver = { 79 "smb", 80 smb_methods, 81 sizeof(struct smb_softc), 82 }; 83 84 static d_open_t smbopen; 85 static d_close_t smbclose; 86 static d_write_t smbwrite; 87 static d_read_t smbread; 88 static d_ioctl_t smbioctl; 89 90 #define CDEV_MAJOR 106 91 static struct cdevsw smb_cdevsw = { 92 .d_open = smbopen, 93 .d_close = smbclose, 94 .d_read = smbread, 95 .d_write = smbwrite, 96 .d_ioctl = smbioctl, 97 .d_name = "smb", 98 .d_maj = CDEV_MAJOR, 99 }; 100 101 static void 102 smb_identify(driver_t *driver, device_t parent) 103 { 104 BUS_ADD_CHILD(parent, 0, "smb", 0); 105 } 106 107 static int 108 smb_probe(device_t dev) 109 { 110 device_set_desc(dev, "SMBus generic I/O"); 111 112 return (0); 113 } 114 115 static int 116 smb_attach(device_t dev) 117 { 118 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 119 120 if (!sc) 121 return (ENOMEM); 122 123 bzero(sc, sizeof(struct smb_softc *)); 124 125 sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev), 126 UID_ROOT, GID_WHEEL, 127 0600, "smb%d", device_get_unit(dev)); 128 129 return (0); 130 } 131 132 static int 133 smb_detach(device_t dev) 134 { 135 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 136 137 if (sc->sc_devnode) 138 destroy_dev(sc->sc_devnode); 139 140 return (0); 141 } 142 143 static int 144 smbopen (dev_t dev, int flags, int fmt, struct thread *td) 145 { 146 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 147 148 if (!sc) 149 return (EINVAL); 150 151 if (sc->sc_count) 152 return (EBUSY); 153 154 sc->sc_count++; 155 156 return (0); 157 } 158 159 static int 160 smbclose(dev_t dev, int flags, int fmt, struct thread *td) 161 { 162 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 163 164 if (!sc) 165 return (EINVAL); 166 167 if (!sc->sc_count) 168 return (EINVAL); 169 170 sc->sc_count--; 171 172 return (0); 173 } 174 175 static int 176 smbwrite(dev_t dev, struct uio * uio, int ioflag) 177 { 178 /* not supported */ 179 180 return (EINVAL); 181 } 182 183 static int 184 smbread(dev_t dev, struct uio * uio, int ioflag) 185 { 186 /* not supported */ 187 188 return (EINVAL); 189 } 190 191 static int 192 smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 193 { 194 device_t smbdev = IIC_DEVICE(minor(dev)); 195 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 196 device_t parent = device_get_parent(smbdev); 197 198 int error = 0; 199 struct smbcmd *s = (struct smbcmd *)data; 200 201 if (!sc || !s) 202 return (EINVAL); 203 204 /* allocate the bus */ 205 if ((error = smbus_request_bus(parent, smbdev, 206 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 207 return (error); 208 209 switch (cmd) { 210 case SMB_QUICK_WRITE: 211 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 212 break; 213 214 case SMB_QUICK_READ: 215 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 216 break; 217 218 case SMB_SENDB: 219 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 220 break; 221 222 case SMB_RECVB: 223 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 224 break; 225 226 case SMB_WRITEB: 227 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 228 s->data.byte)); 229 break; 230 231 case SMB_WRITEW: 232 error = smbus_error(smbus_writew(parent, s->slave, 233 s->cmd, s->data.word)); 234 break; 235 236 case SMB_READB: 237 if (s->data.byte_ptr) 238 error = smbus_error(smbus_readb(parent, s->slave, 239 s->cmd, s->data.byte_ptr)); 240 break; 241 242 case SMB_READW: 243 if (s->data.word_ptr) 244 error = smbus_error(smbus_readw(parent, s->slave, 245 s->cmd, s->data.word_ptr)); 246 break; 247 248 case SMB_PCALL: 249 if (s->data.process.rdata) 250 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 251 s->data.process.sdata, s->data.process.rdata)); 252 break; 253 254 case SMB_BWRITE: 255 if (s->count && s->data.byte_ptr) 256 error = smbus_error(smbus_bwrite(parent, s->slave, 257 s->cmd, s->count, s->data.byte_ptr)); 258 break; 259 260 case SMB_BREAD: 261 if (s->count && s->data.byte_ptr) 262 error = smbus_error(smbus_bread(parent, s->slave, 263 s->cmd, s->count, s->data.byte_ptr)); 264 break; 265 266 default: 267 error = ENODEV; 268 } 269 270 /* release the bus */ 271 smbus_release_bus(parent, smbdev); 272 273 return (error); 274 } 275 276 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); 277 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); 278 MODULE_VERSION(smb, 1); 279